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Seismic velocity contrast across the San Jacinto fault, california, from travel time measurements of ambient noise correlations

SEISMIC VELOCITY CONTRAST ACROSS THE SAN JACINTO
FAULT, CALIFORNIA, FROM TRAVEL TIME MEASUREMENTS OF
AMBIENT NOISE CORRELATIONS
by
Wei Wang
A Thesis Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
MASTER OF SCIENCE
(GEOLOGICAL SCIENCES)
August 2011
Copyright 2011 Wei Wang

We analyze 2 years of continuous ambient noise data recorded at 24 broadband stations around the San Jacinto Fault Zone (SJFZ), California. Using similar techniques as Roux et al. (2005), we obtain noise-based cross-correlations in the frequency range 0.1-1.3 Hz in +/-50 seconds time windows across >200 station pairs with distances ranging from 2 to 130 km. To study the effect of seasonally varying noise sources on the resulting cross-correlations, we stack 3-months of data from winter and summer periods separately. The following two main arrivals are resolved independent of the season: (1) a Rayleigh wave travelling at ~3.2 km/s and (2) an arrival around t=0 likely resulting from teleseismic P-phase with near-vertical incidence. In addition, two phases travelling roughly at 6 km/s and 12 km/s appear during winter which are also attributed to teleseismic P-phases with high apparent velocities. Amplitudes in winter are stronger than in summer, reflecting the seasonally dependent energy content of noise in the microseisms frequency band. An approximate 3-6% velocity contrast across the SJFZ can be resolved from our analysis.

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SEISMIC VELOCITY CONTRAST ACROSS THE SAN JACINTO
FAULT, CALIFORNIA, FROM TRAVEL TIME MEASUREMENTS OF
AMBIENT NOISE CORRELATIONS
by
Wei Wang
A Thesis Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
MASTER OF SCIENCE
(GEOLOGICAL SCIENCES)
August 2011
Copyright 2011 Wei Wang